sqrt(x-7)-sqrt(x)=7

解答

x - 7 - x = 7

x \in R 无解

求解步骤

x - 7 - x = 7

去除平方根

3136 = 196 x

解

3136 = 196 x : x = 16

x = 16

验证解:

x = 16

假

解是

x \in R 无解

2 x + 40 = - 16 - 2 x

1.7 = (\frac{2 ( 10.5 )}{x})

8 x - 1 + 4 = 8

x^{2} - 4 x - 12 = 5 - x

9 x - 7 3 x - 2 = 0